style: format entire depot with nixpkgs-fmt

This CL can be used to compare the style of nixpkgs-fmt against other
formatters (nixpkgs, alejandra).

Change-Id: I87c6abff6bcb546b02ead15ad0405f81e01b6d9e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4397
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
Reviewed-by: lukegb <lukegb@tvl.fyi>
Reviewed-by: wpcarro <wpcarro@gmail.com>
Reviewed-by: Profpatsch <mail@profpatsch.de>
Reviewed-by: kanepyork <rikingcoding@gmail.com>
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: cynthia <cynthia@tvl.fyi>
Reviewed-by: edef <edef@edef.eu>
Reviewed-by: eta <tvl@eta.st>
Reviewed-by: grfn <grfn@gws.fyi>

nix/buildGo/example/default.nix

@@ -8,7 +8,7 @@
 # users a quick introduction to how to use buildGo.
 
 let
-  buildGo = import ../default.nix {};
+  buildGo = import ../default.nix { };
 
   # Example use of buildGo.package, which creates an importable Go
   # package from the specified source files.
@@ -29,7 +29,8 @@ let
   # Example use of buildGo.program, which builds an executable using
   # the specified name and dependencies (which in turn must have been
   # created via buildGo.package etc.)
-in buildGo.program {
+in
+buildGo.program {
   name = "example";
 
   srcs = [